/*! fly - v1.0.0 - 2014-12-22
* https://github.com/amibug/fly
* Copyright (c) 2014 wuyuedong; Licensed MIT */
!function(a){
	a.fly=function(b,c){
		var d={version:"1.0.0",autoPlay:!0,vertex_Rtop:20,speed:1.2,start:{},end:{},onEnd:a.noop},
		e=this,f=a(b);
		e.init=function(a){this.setOptions(a),!!this.settings.autoPlay&&this.play()},
		e.setOptions=function(b){
			this.settings=a.extend(!0,{},d,b);
			var c=this.settings,
			e=c.start,
			g=c.end;
			f.css({marginTop:"0px",marginLeft:"0px",position:"fixed"}).appendTo("body"),
			null!=g.width&&null!=g.height&&a.extend(!0,e,{width:f.width(),height:f.height()});
			var h=Math.min(e.top,g.top)-Math.abs(e.left-g.left)/3;
			h<c.vertex_Rtop&&(h=Math.min(c.vertex_Rtop,Math.min(e.top,g.top)));
			var i=Math.sqrt(Math.pow(e.top-g.top,2)+Math.pow(e.left-g.left,2)),
			j=Math.ceil(Math.min(Math.max(Math.log(i)/.05-75,30),100)/c.speed),
			k=e.top==h?0:-Math.sqrt((g.top-h)/(e.top-h)),
			l=(k*e.left-g.left)/(k-1),m=g.left==l?0:(g.top-h)/Math.pow(g.left-l,2);
			a.extend(!0,c,{count:-1,steps:j,vertex_left:l,vertex_top:h,curvature:m})
		},
		e.play=function(){this.move()},
		e.move=function(){
			var b=this.settings,c=b.start,
			d=b.count,
			e=b.steps,
			g=b.end,
			h=c.left+(g.left-c.left)*d/e,
			i=0==b.curvature?c.top+(g.top-c.top)*d/e:b.curvature*Math.pow(h-b.vertex_left,2)+b.vertex_top;
			if(null!=g.width&&null!=g.height){
				var j=e/2,
				k=g.width-(g.width-c.width)*Math.cos(j>d?0:(d-j)/(e-j)*Math.PI/2),
				l=g.height-(g.height-c.height)*Math.cos(j>d?0:(d-j)/(e-j)*Math.PI/2);
				f.css({width:k+"px",height:l+"px","font-size":Math.min(k,l)+"px"})
			}
			f.css({left:h+"px",top:i+"px"}),
			b.count++;
			var m=window.requestAnimationFrame(a.proxy(this.move,this));
			d==e&&(window.cancelAnimationFrame(m),b.onEnd.apply(this))
		},
		e.destory=function(){f.remove()},e.init(c)},
		a.fn.fly=function(b){return this.each(function(){void 0==a(this).data("fly")&&a(this).data("fly",new a.fly(this,b))})}
}(jQuery);